Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3aa7b628ee10c74…

MALICIOUS

PDF

91.6 KB Created: 2021-05-28 04:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d4d0623688805ae4ad38e1ffb6bb0008 SHA-1: cd9310afc217c9d755eb671d8db6d327bd7f6a4d SHA-256: b3aa7b628ee10c74e00e2f0b8342c763a5da771073d5f3994dd98b40037c65d0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/strik?utm_term=avon+commission+chart+2020 PDF link annotation
    • https://rowurasivove.weebly.com/uploads/1/3/4/3/134357219/soxobeg.pdfIn PDF document text
    • https://xewezepi.weebly.com/uploads/1/3/0/8/130813550/03b853b79806.pdfIn PDF document text
    • https://gedenotovet.weebly.com/uploads/1/3/1/3/131379555/bovuzoperetesa.pdfIn PDF document text
    • https://kigilepoda.weebly.com/uploads/1/3/4/9/134901239/bivomumena.pdfIn PDF document text
    • https://dujeranisijoku.weebly.com/uploads/1/3/0/7/130776063/nusiramasexo.pdfIn PDF document text
    • https://ranazujip.weebly.com/uploads/1/3/5/3/135398887/nidun_xosuvazapabumus.pdfIn PDF document text
    • https://megewesaj.weebly.com/uploads/1/3/0/7/130738707/7967741.pdfIn PDF document text
    • https://jonapofa.weebly.com/uploads/1/3/4/6/134699055/c47e16.pdfIn PDF document text
    • https://fenuligor.weebly.com/uploads/1/3/2/6/132695430/5040828.pdfIn PDF document text
    • https://jijaxiwiruba.weebly.com/uploads/1/3/5/3/135333012/josofi_lefalazame_kejupix.pdfIn PDF document text
    • https://noribazab.weebly.com/uploads/1/3/1/8/131871745/f4c5159976d186.pdfIn PDF document text
    • https://gowapatemik.weebly.com/uploads/1/3/5/3/135319450/ec19689e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5816ac62-efc0-4fb9-8c89-454e8d515782/76692435474.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58f6d3ab-a465-4447-8294-14c0c24b96eb/best_cb_mic_for_cobra_29.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ca19580-1c37-4af0-95c2-cd302b76b5e7/65611777551.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d1f1813-2464-4624-9696-7b4b30758d31/66573910907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/952e3b1a-644e-435a-9e97-8f95bf19a425/mekonaropadifuzobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b6da5a6-7bbb-4b1c-872f-d0458aa0a3a6/dd_warlock_spells_and_cantrips.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8cac79e-5960-46d4-98c4-8f5e2403bf8c/loropor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa492cc4-e4df-40f9-ab59-44926259004c/55112472046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36d697e9-a44e-4c6c-b109-3aa67a03ac53/cribbage_rules_who_goes_after_31.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a97e26fb-f318-4550-8e92-017b8bab2191/kopajil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bea159a6-5716-4fb6-954e-6397d5f109c9/65612364828.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 6440 bytes
SHA-256: edf517a561ed5132c6c1d5718ac6ff9d870a00e6f43a91762fd168a2279cca75
font_01_sfnt_off00010077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10077 5328 bytes
SHA-256: b76243f0a18f38a060b3a71b426f6e417d33360a68593d62aa46dc8fe208730b
font_02_sfnt_off00011264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11264 3424 bytes
SHA-256: fcb68466dc41dda01dea2262d52b5c3ed4f8d746b13ca2b00091054b10513d20
font_03_sfnt_off00012067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12067 12160 bytes
SHA-256: 696e4f3ed4ee982ebc51f8ad429f2c97c65ac4658bde3c322e6c9ff3011e054b
font_04_sfnt_off000149dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149DD 16036 bytes
SHA-256: 149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1

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